Additional "vendor options" properties for :ref:`sld-extensions_composite-blend`:

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   * - Property
     - Required?
     - Description
     - Default value
   * - ``x-composite``
     - No
     - Allows for both alpha compositing and color blending options between symbolizers.
     - N/A
   * - ``x-composite-base``
     - No
     - Allows the rendering engine to use the symbolizer mapping to define a "base" buffer for subsequent compositing and blending using ``x-composite``. See the section on :ref:`Feature Styles <ysld_reference_featurestyles_composite>` for more details.
     - ``false``
